US4892035A - Continuous damping means for off-set printing machines - Google Patents

Continuous damping means for off-set printing machines Download PDF

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Publication number
US4892035A
US4892035A US07/231,185 US23118588A US4892035A US 4892035 A US4892035 A US 4892035A US 23118588 A US23118588 A US 23118588A US 4892035 A US4892035 A US 4892035A
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US
United States
Prior art keywords
feed roller
wiper element
roller
processor
damping
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/231,185
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English (en)
Inventor
Giancarlo Terzuolo
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GRAPHO ENGINEERING Srl
Grapho Engr Srl
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Grapho Engr Srl
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Publication date
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Assigned to GRAPHO ENGINEERING S.R.L. reassignment GRAPHO ENGINEERING S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TERZUOLO, GIANCARLO
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Publication of US4892035A publication Critical patent/US4892035A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/26—Damping devices using transfer rollers

Definitions

  • the present invention relates to a continuous damping system with automatic regulation for offset printing machines.
  • a so-called duct roller having an elastic covering covered by swanskin or “stocking” is journaled idle on its opposite ends on two oscillating arms. It takes the layer of water from the “fountain roll” and brings it into contact with a roller parallel to it, known as the “distributor", having a chrome-plated metal surface and imparted an axial reciprocating motion and a rotating motion, driven by gears at the same peripheral speed as the plate.
  • the water fed to the "distributor” roller is transferred by the latter to two “damping” rollers with elastic covering and also covered with a swanskin or “stocking". They rotate idly, driven by friction with the plate and the "distributor", against which the contact pressure is registered by means of adjustable supports.
  • the amount of water applied to the plate (or matrix) can be dosed very well.
  • the system is not without substantial defects.
  • the damping liquid consists primarily of water comprising the addition of alcohol which is adapted to lower the surface tension of the water, with the result that each drop, upon flattening out, wets a larger area of the plate or matrix, obtaining a proper water-ink equilibrium with the use of a smaller amount of water.
  • the presence of alcohol in the damping liquid has the result that the liquid evaporates more rapidly, favoring the drying out of the fresh printing.
  • the system is, however, functional provided that the liquid is distributed in a very thin uniform film without any discontinuity.
  • a damping device developed with the above mentioned concepts is the one devised by DAHLGREEN. It also provides for the use of a constant-level vessel containing the damping liquid at a temperature and alcohol concentration which are also constant.
  • the ordinary "fountain” roller with chrome-plated, smooth surface dips into said vessel, driven by an independent motor of adjustable speed and with a uniform peripheral velocity much slower than that of the plate.
  • the "fountain roller” removes a certain amount of liquid which a “dosaging” roller, covered with hydrophilic elastic material and with a perfectly smooth surface, driven by the "fountain roller” at a peripheral speed not much different from the latter, calibrates in a layer which is as thin and uniform as possible.
  • This layer is, in part, given up to the first of the inking rollers already charged with ink, which is driven by the plate so as to advance at the same peripheral speed as the latter.
  • the differences in the peripheral speed on contact causes a spreading out of said liquid layer or film so as to make it even thinner.
  • the shaft of the "dosaging" roller can be brought slightly out of parallelism with respect to the shaft of the "fountain” roller so as to increase the contact pressure in the central zone in order to compensate for the effects of flexure of the rollers.
  • An object of the present invention is therefore to provide a continuous damping system for offset printing machines which is free of the drawbacks of the known systems, and is capable of automatically providing, at any moment, the proper amount of liquid to the plate, namely neither too much nor too little, it taking automatically into account the value and variation of the parameters adapted to influence the operation of the damping and thereby the quality of the printing, and which does not suffer from the inevitable mechanical deformations of the various rollers of the damping system.
  • the present invention provides a continuous damping which produces a film of damping liquid which is extremely thin and which cannot be achieved with the known continuous damping system, and which further includes a control system adapted to be influenced in real time by the variation of the operating conditions of the machine, and which results in a covering of the entire surface of the plate with the same amount of damping liquid regardless of the speed of printing and the variation of other parameters such as the temperature of the various parts of the machine, the relative humidity of the air and the viscosity of the damping liquid, both in the event that said liquid contains water to which the customary additives have been added and in the event alcohol has or has not been added to the water.
  • said processing mean comprise a processor ("microprocessor") to which data entered by means of a keyboard can also be transmitted; all this data is processed on basis of programs ("software”) which establish the relations between the said data and the optimal conditions of the damping of the plate (or “matrix”) during the operation of the machine.
  • processor microprocessor
  • software programs
  • the thrust means comprise a plurality of small cylinders actuated by a pressurized fluid, the rods of the cylinder act on said wiping element from the side of the latter diametrically opposite to that facing the periphery of the fountain roller; and that each of said cylinders is fed by a pressure regulator controlled by pulses transmitted from the processor.
  • the system includes sensors adapted to detect the temperature and relative humidity of the air substantially in the zones of the machine where the said cylinders for acting on the wiping element are located.
  • the system also includes a plurality of devices for analyzing the structure of a peripheral strip or marking of the plate and to provide the processor with information in the form of electric pulses so as to permit the transmission to the pressure regulators associated with the cylinders corresponding to said strip of control pulses for determining thrusts necessary in order to obtain in these zones thicknesses of the film of damping liquid which are required for the optimal damping of the plate.
  • the speed motor driving the feed roller imparts a reciprocating axial movement to means for the application of damping liquid including an elongated elastic wiper element and the means for pressing the wiper element against the surface of the feed roller.
  • FIG. 1 is a diagrammatic view, in side elevation, of the damping device in accordance with the system of the invention, cooperating with the plate cylinder of an offset printing press,
  • FIG. 2 is a perspective view showing the system of FIG. 1 in greater detail.
  • FIG. 3 is a cross-sectional view which, on a larger scale, shows a detail of construction of the damping device according to the invention.
  • FIG. 4 is a section taken along the line IV--IV of FIG. 1.
  • 1 is the plate cylinder of an offset printing machine, cooperating, in known manner, with the rubber blanket cylinder 2.
  • the feed roller 4 the so-called fountain roller, dips into said vessel.
  • the feed roller is being driven by the dc motor 5 (FIG. 2) in such a manner as to rotate in the direction of the arrow 6, with the possibility of varying the speed of rotation thereof.
  • the fountain roller 4 is covered with a layer (not shown) of hydrophilic material which has on its surface microporosities for transferring the damping liquid uniformly.
  • the fountain roller is tangent to the damping roller 7 which serves to wet the plate (not shown) applied on the periphery of the plate cylinder 1, and to wet an intermediate roller 7a which is arranged below the first inking roller 8 and tangent to the latter.
  • Wiper element 9 is formed of an element of elongated shape, of circular cross section, made of elastic material, for instance silicone material.
  • the length of the element 9 is equal to that of the fountain roller 4 and it is housed within a linear groove 10 the depth of which is greater than the diameter of the wiper element 9, provided in the periphery of a stationary support bar 11 (see FIG. 3).
  • This groove 10 communicates with preferably three continuous diametrical holes 12 arranged at equal distances between the opposite ends of the bar 11.
  • the central hole 12 is lying in the transverse median plane of the fountain roller 4 while the lateral holes are equidistant from the opposite ends of the bar 11.
  • Each hole 12 communicates, from the side opposite the groove 10, with a cavity 13 formed on the outside of the body of the bar 11.
  • the cavity 13 is divided by a membrane 14 from a cavity or chamber 15 provided in a cover 16 fastened to said body.
  • each membrane 14 there is attached a rod 17 which extends through the continuous hole 12 and the free end of which rests against the central part of thrust bars 18 of elongated shape, housed within the respective groove 10 at a small distance from the corresponding end.
  • Each bar 18 is partially inserted within a cavity 19 provided in the side of the counteraction bar 20 on the side of the latter facing the end of the groove 10 and is pushed with its end against two shoulders formed at each side of said cavity 19 (FIGS. 3 and 4).
  • the dimensions of the bars 18 and 20 and the length of the rod 17 are such that the wiper element protrudes slightly at all times from the groove 10.
  • the processor or microprocessor
  • the microprocessors can also receive signals of the temperature and relative humidity of the air transmitted by detectors, which are arranged, for instance, on opposite sides of the machine.
  • Such signals duly processed on basis of the corresponding software introduced into the processor are transformed into control signals transmitted by conductors 26, 27, 28 and 29, for controlling the speed of rotation of the motor 5 and, acting on the pressure regulator 21, the pressure of the fluid in the chamber 15, determining the amount of the thrust with which the rods 17 and the counteraction bar 20 of the different groups press the wiper element 9, thereby determining the thickness of the film of damping liquid which is applied to the damping roller 7 and finally to the different strips of the plate.
  • the keyboard 30 through which there can be entered corrections by means of suitable software for enabling the taking into account of fixed parameters, such as the viscosity of the damping liquid.
  • the processor 24 could be replaced by a simple processing circuit without thereby impairing the obtaining of an automatic continuous regulation of the thickness of the film of damping liquid as a function of the speed of rotation of the plate cylinder and of the structure of the plate.
  • the means for pushing or pressing the wiper element 9 against the periphery of the fountain roller could be present in a number other than three and could be controlled by a single pressure regulator 21 which, in its turn, could be of any type known per se obtainable on the market.
  • the actuators which push the wiper element against the periphery of the "fountain roller” could, also be formed of a plurality of chambers with elastic walls of elongated shape aligned with each other, disposed between said wiper element and the end of the groove which houses it and communicating by pressure regulators with a line for the feeding of fluid under pressure.
  • the group which comprises said element and the corresponding thrust or support members can, finally, be imparted a reciprocating movement obtained from the parts which drive the fountain roller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Soil Working Implements (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
US07/231,185 1987-08-17 1988-08-11 Continuous damping means for off-set printing machines Expired - Fee Related US4892035A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67719 1987-08-17
IT8767719A IT1211266B (it) 1987-08-17 1987-08-17 Sistema di bagnatura continua a regolazione automatica per macchine da stampa offset

Publications (1)

Publication Number Publication Date
US4892035A true US4892035A (en) 1990-01-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US07/231,185 Expired - Fee Related US4892035A (en) 1987-08-17 1988-08-11 Continuous damping means for off-set printing machines

Country Status (7)

Country Link
US (1) US4892035A (de)
EP (1) EP0305796B1 (de)
JP (1) JPH01120341A (de)
AT (1) ATE89220T1 (de)
CA (1) CA1294489C (de)
DE (1) DE3880933D1 (de)
IT (1) IT1211266B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038681A (en) * 1988-01-19 1991-08-13 Jimek International Ab Control method and apparatus for spray dampener
US5070783A (en) * 1990-05-18 1991-12-10 Ireton Carl A Adjustable doctor blade mounting means
USRE36083E (en) * 1992-09-22 1999-02-09 Heidelberger Druckmaschinen Ag Inking unit for printing presses
US5887521A (en) * 1997-07-11 1999-03-30 Kabushiki Kaisha Tokyo Kikai Seisakusho Dampening water supply device
US6655272B2 (en) * 2000-11-24 2003-12-02 Heidelberger Druckmaschinen Ag Dampening control method taking account of a plurality of variables that influence the printing process
US20050252536A1 (en) * 2004-05-14 2005-11-17 Ciliberti Michael N Wiper blade wash station, spray bar and process for cleaning the wiper blade
WO2005108085A1 (en) * 2004-05-07 2005-11-17 Baldwin Jimek Ab A control system and a method for a printing press
US20150047520A1 (en) * 2012-04-24 2015-02-19 Kba-Notasys Sa Intaglio printing press

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0358845A (ja) * 1989-07-28 1991-03-14 Tokyo Kikai Seisakusho Ltd 平版印刷機の湿し水装置
JPH0811439B2 (ja) * 1989-12-20 1996-02-07 テクノロール株式会社 オフセット印刷機ダンプニング装置
DE4000912C1 (de) * 1990-01-15 1991-05-29 Jagusch & Co, 8649 Wallenfels, De
DE4431646A1 (de) * 1994-09-06 1996-03-07 Koenig & Bauer Albert Ag Dosierwalze an einem Feuchtwerk einer Offsetrotationsdruckmaschine
WO1999048693A1 (en) * 1998-03-23 1999-09-30 Goss Graphic Systems, Inc. Method and apparatus for controlling a dampener of a lithographic printing press
DE102008049355A1 (de) * 2008-09-29 2010-04-01 Manroland Ag Offsetdruckmaschine
EP3132933B1 (de) * 2015-06-03 2020-01-08 I. Mer Co., Ltd. Dämpfungsvorrichtung für drucker und damit versehener drucker

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749012A (en) * 1971-10-20 1973-07-31 Addressograph Multigraph Moisture dispensing unit for lithographic fountain system
US3902416A (en) * 1974-12-04 1975-09-02 Dick Co Ab Moisture control for lithographic machines
US4029008A (en) * 1976-05-24 1977-06-14 Addressograph Multigraph Corporation Moisture control system
US4140056A (en) * 1977-08-01 1979-02-20 Addressograph-Multigraph Corporation Ink and moisture control system with ink/moisture interface
US4156388A (en) * 1977-08-01 1979-05-29 Am International, Inc. Ink and moisture control system with evaporation compensation
DE2849096A1 (de) * 1978-11-11 1980-05-14 Maschf Augsburg Nuernberg Ag Feuchtwerk
US4570539A (en) * 1983-08-30 1986-02-18 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Method of adjusting the inking unit of a printing machine and a measuring device for performing the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR806676A (fr) * 1935-05-22 1936-12-22 Dresden Leipziger Schnellpress Machine à imprimer en creux
GB1324690A (en) * 1970-10-24 1973-07-25 Champion Paper Co Ltd Printing apparatus
DE2057689B1 (de) * 1970-11-24 1971-12-16 Maschf Augsburg Nuernberg Ag Einrichtung an Rotationsdruckmaschinen zur Steuerung des Anpressdruckes einer Rakel
US4289167A (en) * 1978-10-30 1981-09-15 Ryco Graphic Manufacturing, Inc. Non-drip fluid delivery system
DE3211157A1 (de) * 1982-03-26 1983-10-06 Roland Man Druckmasch Verfahren und vorrichtung zum befeuchten von druckplatten

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749012A (en) * 1971-10-20 1973-07-31 Addressograph Multigraph Moisture dispensing unit for lithographic fountain system
US3902416A (en) * 1974-12-04 1975-09-02 Dick Co Ab Moisture control for lithographic machines
US4029008A (en) * 1976-05-24 1977-06-14 Addressograph Multigraph Corporation Moisture control system
US4140056A (en) * 1977-08-01 1979-02-20 Addressograph-Multigraph Corporation Ink and moisture control system with ink/moisture interface
US4156388A (en) * 1977-08-01 1979-05-29 Am International, Inc. Ink and moisture control system with evaporation compensation
DE2849096A1 (de) * 1978-11-11 1980-05-14 Maschf Augsburg Nuernberg Ag Feuchtwerk
US4570539A (en) * 1983-08-30 1986-02-18 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Method of adjusting the inking unit of a printing machine and a measuring device for performing the same

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038681A (en) * 1988-01-19 1991-08-13 Jimek International Ab Control method and apparatus for spray dampener
US5070783A (en) * 1990-05-18 1991-12-10 Ireton Carl A Adjustable doctor blade mounting means
USRE36083E (en) * 1992-09-22 1999-02-09 Heidelberger Druckmaschinen Ag Inking unit for printing presses
US5887521A (en) * 1997-07-11 1999-03-30 Kabushiki Kaisha Tokyo Kikai Seisakusho Dampening water supply device
US6655272B2 (en) * 2000-11-24 2003-12-02 Heidelberger Druckmaschinen Ag Dampening control method taking account of a plurality of variables that influence the printing process
WO2005108085A1 (en) * 2004-05-07 2005-11-17 Baldwin Jimek Ab A control system and a method for a printing press
US20050252536A1 (en) * 2004-05-14 2005-11-17 Ciliberti Michael N Wiper blade wash station, spray bar and process for cleaning the wiper blade
US20150047520A1 (en) * 2012-04-24 2015-02-19 Kba-Notasys Sa Intaglio printing press
US20150135977A1 (en) * 2012-04-24 2015-05-21 Kba-Notasys Sa Intaglio printing press
US9315011B2 (en) * 2012-04-24 2016-04-19 Kba-Notasys Sa Intaglio printing press
US9597864B2 (en) * 2012-04-24 2017-03-21 Kba-Notasys Sa Intaglio printing press

Also Published As

Publication number Publication date
EP0305796A2 (de) 1989-03-08
CA1294489C (en) 1992-01-21
IT8767719A0 (it) 1987-08-17
IT1211266B (it) 1989-10-12
DE3880933D1 (de) 1993-06-17
EP0305796B1 (de) 1993-05-12
JPH01120341A (ja) 1989-05-12
EP0305796A3 (en) 1989-03-22
ATE89220T1 (de) 1993-05-15

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AS Assignment

Owner name: GRAPHO ENGINEERING S.R.L., VIA MONTERUMICI 33/AB,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TERZUOLO, GIANCARLO;REEL/FRAME:004965/0142

Effective date: 19880930

Owner name: GRAPHO ENGINEERING S.R.L., ITALY

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Effective date: 19880930

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Effective date: 19940109

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362